> The trick is that there are two sensors for each wheel
> so you will get 2 impulsstreams out of one wheel
> the phases are 90 degrees shifted
>
> to make an encoding you have to look which edge comes
> first and then you read the second egde  depending on the
> direction one of the egdes comes before the other one

Exactly. It creates four distinct combinations in a repeating
sequence like this:

00
01
11
10

It will always be in this order for one direction, and the reverse
order for the other direction. This yields a resolution 4 times the
number of slots in the wheel.


---
                                        Peace,
                                        William Kitchen
                                        bill@iglobal.net

The future is ours to create.